Type-writing machine.



J. A. HAGERSTROM. TYPE WRITINGVMAGHINE. APPLICATION FILED SEPT. 25,1907.

p Pgtentedlqov. 2, 1909.

4 SHEETS-SHEET 1.

WRNE rs ED SEPT. 25, 1907.

Patented Nov. 2, 1909.

4 SHEETS-SHEET 2.

sagsmr.

WIT 53353 I it J. A. HAGERSTROM. TYPE WRITING MACHINE. APPLICATION FILEDSEPT. 25, 1907.

Patented N012, 1909.

4 SHEETEwSHEET s lNVENTOH aJA W/TNESSEiS J. A, HAGERSTROM. 7' I TYPEWRITING MACHINE.

APPLIUATION FILED SEPT, 25, 1907- 938A8Q, Patented N012, 1909.

4 SHEETS-SHEET 4.

l uB-mmaa ITED STATES PAEENT ()FFICE.

JOHN A. HAG-ERSTEOM, F BROOKLYN, NEW YORK, ASSIGN'OR 'IOVICTORTYPEWRITER COMPANY, OF NEW YORK, Y., A COBPORATIONOF NEW YORK.-1.."

TYPE-WRI ING MAcHiNE.

Specification'cd. Letters Patent.

Patent-ed Nov.

Application filed September 25, 1907. Serial No. 394,436. 1

To all whom it may concern:

Be it known that I, JOHN A. HAGERSTROM, a citizen of the United States,anda resident of the borough of Brooklyn, county of Kings, and State ofNew York, have invented'a new and useful Improvement in Type-lVritingMachines, of which the following is a specification. v

My invention refers broadly to escapement mechanism and in particular tothe arrangement of the dogsby the oscillation of which the escapementwheel performs its step by step motion, causing in turn by this motionthe dogs tomove positively as required.

Furthermore, my invention relates to. a

'particular arrangement of the operating dogs by' means of whichtheescapement wheel is caused to perform its forward motion equal to thedistance between two teeth in two steps, a smaller and a larger step, ora larger and then a smaller step,'atwill.

My invention is illustrated in the accompanying drawings in which- IFigure 1 is a rear view of typewriting machine showing the location ofthe escapemen't mechanism. Fig. 2 is aside view of the machine. Fig. 3is an enlarged detail view of the escapement mechanism. vFig. -4 is aView at right angles thereto. Fig. 5 is a sectional view of Fig. .3 online 5--5 Fig. 6

.is a sectional view of Fig. 3 on line 6-6.

Fig. 7 is a diagram, indicating the relative position of the two dogsand the two teeth of Fig. 3 in plan view. Fig. 8 is a modification ofFig. 3.. Fig. 9 is a view at right angles thereto. Fig. 10 is a modifiedform of Fig. 9. Fig. 11 is a sectional view of the cross section .online X-X of Fig. -8. Fig. 12 is a modification of the dogstructure-shown in Fig. 10.. I v

In Figsl and 2,10 is a rocking lever sultably pivoted in the machineframe at 9 and operated by the push and pull rod 11 from the universalbar 12 of the machine. The escapement mechanism which is operated byrocking lever 10 and shown in full view Fig. .1, isillustrated in Figs.3 and 4 in detail and in enlarged seale As may be seen fromthesefigures, lever 10 is U-shaped at its upper end, which is shown alsoin cross section, on lines 5 -5 and 6-6 respectlvelyin Figs. 5 and 6.Within this U-shapedhead are pivoted dogs 13 and 14; dog 13 by-pivot'pin 15 as a lever of the first order and dog 14 by means of pin 16 as alever of the secondorder. Furthermore, the throw of. dog 14 is limitedby having pivot 15 pass through the opening 17 of this dog. Dog'13isguide d at its lower end by pin 18 in a recess 19 provided in dog 14so that when dog 14 is moved in one direction dog 13 will 'be'positivelymoved in the other directionl'. The

upper ends of dogs. 13 and 14fare suitably shaped to engage the-teeth20'ofesca'pementwheel 21 which may be suitablyjournaled and disposed inthe machine frame; and

driven in any wellknown mannerusedin this kind of'machineL It'will beseen'that wheel 21 thus forms the'spacedfl'rnemjber of the'escapementmechanism, while' rocking lever'10 with its dogs forms the detainingand'spacing member of the mechanism. t

In Figs. 3 and 4 tooth 20 is shown "in engagement with dog 14, justhaving thrown this dog the farthest to the left on its rotationindicated by the arrow in Fig.3. This has caused dog 13 to move thefarthest to the right. If now rocking lever 10 is rocked in thedirection shown by the arrows in'F ig'. 4 tooth 20 willsl'ide off dog14' and on dogia throwing this dog the farthest to 'the left,

which will cause dog 14 owing to its connection with dog 13 abovedescribedfto be thrown the farthest to the rightas far as opening 17will allow. In slidingfwith one tooth from dog 14 to dog 13 wheel'21 hasmade a' small step forward. If now rocking lever 1() is moved oppositeto the direction indicated by the arrows the tooth 20 now-in engagementwith dog 13 will slide off this dog behind dog 14 and be free so as tocause wheel 21 to move in the direction of the arrow. In the meantime do14 has come by the same rocking motion of lever 10 into the path of'thenext tooth, which will-strikeiit,

thereby also throwing dog 13, which. is now free to move, in theopposite direction until dog 14 is stopped'by pin 15 in opening 17'causing the wheel to perform a large step, whereafterfboth dogs assumeagain-the pos1- tion shown in Fig. 3, ready for the next cycleof'mo'vements as described above... The dimensions of the throw andmovement of both dogs are proportioned so that when dog113, is thrownthe farthest to the {rightiits face-. stands slightly behind thatof dog14' is then thrown the farthest to the left (Fig.

3) This will facilitate the toothjin engage-.

ment with dog '14 to slide off this do and on d'ogi 13. Furthermore thethrow o ,uog 14'.

to.the right is far enough to allow a tooth in engagement with dog 13-toslide between dogs '13 and 14 when lever 10 is rocked opposltely to thedirection shown by the arrows in Fig. 4.

7 shows diagrammatically the instant at which rocking lever 10 is aboutto move in the direction of the arrow shown in Fig. 4 in ordertocause-tooth 20 to slide off dog 14 and on dog 13. Owing to theirconnection with each other, the relative movement of the two dogs is so,that when a tooth, in the at rest posltion of the machine in engagementwith dog 14, slides off this dog and on dog 13, always a small step isperformed by wheel 21, and on sliding ofi dog 13 and at the same time onengagement of the next tooth with dog 14 always a large step isperformed by wheel 21, the sum of both steps.

being equal to the forward movementiof the carriage one full letterspace. Rocking lever 10 is disposed in the machine so that escapementwheel 21 performs its small step when any of the keys of the machine ispressed down, and the larger step when this key is released by theoperator; the sum of these two steps-being equal to the distance'betweentwo teeth -of Wheel 21 or also equal to the forward movement of thecarriage the full space Of one letter as'stated already. The arrangementof moving the carriage the space of one letter in two unequal steps, thesmall step when a key is ressed down and the large step when this ey isreleased, is commonly used in typewriti-pg machines for writing at anaverage speed. It is well known that it is more advantageous for veryfast writing, to have the carriage and thus the escapement wheel performthe large step when the ke is pressed down, and the small step when t ekey is, released. In order to obtain this reverse sequence of stepswhenever desired by the operator I have provided the following means wich are illustrated in Figs. 8' to 12.

As shown in Figs. 8 and 9, 10 is the rock- 7 ing lever operated from theuniversal bar as described before. The U-shaped head 22 which carriesthe dogs forms a separate part which is fastened to'the upper end oflever 10 by means of a thumb-screw 23 so that it may. slide transverselyto the longitudinal axis of leverlO in a direction transversely to theplane of rotation of wheel21 on an incline, the purpose of which will beexplained later on. Within the U. shaped head 22 are pivoted do s 14, 13and 14 (F1 .9). Dog 13 is-pivote again as a lever o the first order bymeans" of pivot pin 15, while dogs 14 and 14 (in Fig. 8 only dog 14 canbe seen) are pivoted as levers of the second order by means of pivot-pin16, to which both dogs are fixed in line with each other so that theywill at any time perform their motion together. Furthermore dog 13 isspectively. The throw of dogs 14 and 14 is limited-in a similar manneras shown in Fig; 3 by having pivot pin 15 of dog 13 passing throughopenings, '17 and 17" of do 14 and 14" respectively.- The purpose ofaving three dogs is to enable the 0 erator to o erate either with do 13an 14 or with dbgs -14 and 13 at W1 by sliding the U-shaped head 22inslot 24 either to the left or to the right. Fig. 9 shows the U-shapedhead 22 in a positionto causev dogs 14 and 13 to control the step bystep movement of escapement wheel 21. One of its teeth 20 is at the timeabutting against dog- 14 which has been thrown farthest to the left (ina similar manner as shown in Fi 3) and thus caused dog 13 to move thearthest to the right -(Fig. 8).- If now by operating rockinglever 10,head 22 is rocked to the right (F i 9), the tooth abuttingagainst' dog14 wil slide off do 14 and on dog 13- causing wheel 21 to per orm asmall step in the same manner as described before with regard to Fig. 3.If now rocking lever 10 is rocked in opposite direction, tooth 20, now

in engagement with dog 13 will slide '01? this'dog, escape behind dog 14and be free so as to cause wheel 21 to move forward until the next toothabuts against do 14, I

which has been moved by the same roc ing motion of lever 10 into thepath of this tooth as described before. This will cause dog 13 to moveoppositely to the direction in which the teeth approach the dogsand backinto the position shown in Fig. 8 which shows the device when themachine is at 2 1 will be slightly behind i that of do 14 in thedirection of the arrow shown in ig. 8 so that when U -shaped head 22 ,ismoved tothe left by rocking lever 10 (Fig. 9) the tooth in engagementwith dog 14 will easily slide off this dog and on dog 13, in the samemanner as described before.

Assuming now that in operating with dogs 13and 14, rocking'lever 10 isdisposed in the same manner as described with regard to Fig. 3, so thatby depressing one of the keys 20 of the machine, a tooth in engagementwith dog 14' will slide off this dog and on dog 13 andby releasing thekey, the. tooth now in-jengagement with dog 13 will be freed and thusthe escapement wheel will make first'its small step and then its largestep, the sum of which is equal to one letter space of the platenmovement. This would be the position of the escapement device suit ablefor writing at ordinary speed. If now head 22 is shifted on rockinglever 10 to the of escapement' wheel 21 and it is evident that wheel" 21will make its larger step on depressing akey of the machine and thesmaller step on releasingthe'key, since now the rocking ofhead 22 to theleft will cause a tooth in engagement with dog 13 to be freed and thusthe wheel 21 to perform the larger step while formerly a rocking oflever 10 to the left caused a tooth to slide from dog 14 to 13 and thusthe wheel to perform l a small step.

It has been stated before that the position shown in Fig. 8-, that iswith a tooth resting on dog 14 is the position which shows the device atrest and set for writing at ordinary speed. If nowthe operator desiresto adjust the' device for fast writingby shifting head 22 on lever 10 tothe left (F 1g. 11), the tooth in engagement with dog 14 will be causedto slide off this dog and on dog 13 on'which it now stays when themachine is at rest. This has caused wheel 21 to per-. form a small stepunintentionally and so in turn the carriage to-move a small ste forwardin the writing direction. If this adjustment is made for instance by theoper- 'ator' at the beginning of anew line, several other lines beingwritten with the device set for slower writing, this new line will notcommence with the s'ame'margin as the other lines written but will havea margin-which is larger by the space of a small step of the carriage.This small step could not be compensated by the operatorby shifting thecarriage back, since the carriage of machines commonly used can beshifted in either direction only a full letter space. 'In order tocompensate for this lost small step head 22 is shifted on lever 10 on asurface 25 inclined at a suitable angle to the shiftin direction (Fig.11). If now head 22 is sh fted from the right to the left inorder to setthe device for fast writing as described above head 22 will move-at thesame time in the direction indicated by the arrow in Fig. 11, which willbring the face of dog 13 on the same line on which the face of dog 14 isshown in engagement with dotted tooth 20. By this arrangement isobtained, that the tooth formerly in engagement with dog 14 has beencaused to'slide on dog 13 without: causing the escapement 'wheel toperform a step, against whichdo'g thefte eth of wheel '21 now hear whenthe machine is at rest. On the other hand if the device is to be shiftedfrom the position described- 'above back into 'theposition shown inFig.- 11 in orderto set'the machine from fast writing back to slowwriting a tooth 2O nowresting on dog 13 as described will slide off thisdog and escape behind dog v 14 the next tooth now bearing against'dog 14thus causing the.-

wheel to perform a large step. which is actu ally lost. But since head22 is now being shifted down the incline 25 back into the position shownin Fig. 11 also a small step will be lostwhich in addition to the lost 1lar e step is vequal to one full letter space which the wheel has causedthe carriage to move forward in the writing direction when the deviceisv set from fast writing back to .slow writing. This lost space may nowbe .Fig. 10.

In the structure shown in this figure two dogs 13 and 13 are pivoted aslevers of the first order and coupled together by means of pin 18forming their point of application, while only one dog 14 pivoted, as alever of the second order is provided and disposed between dogs 13 and13 'The throw of this lever is limited in the same manner as shown inFigs. 8 and 9 by pin 15 passing through opening 17 of dog. 14.

while the point of resi-stance'of this dog is also located as shown inFigs. 8 and 19' by pin 18 passing through guide slot 28, I-n

. this modific ation the teeth of hen 2 1.would abut when at restnormally, when the device is set for slow writing, against the middledog 14, while in' case of fast writing the teeth'will abut when at restagainst the outer dog 13 as shown in Fig. 10. r

Furthermore another modification may be ,made without departingfrom thespirit of my invention by having the dogs in Fig. 12 disposed relativelyto each other as shown in Fig. 9 but the dogs 14-and 14? made in one Ushaped piece which is pivoted in head 22 by means of pivot screws 26while the pin 18 shown in Fig. 9 fastened to dog 13.may be divided intotwo pieces 18 and 18 fastened to dogs 14 and 14 respectively andengaging in recesses 27 and 27 respectively provided in dog 13 andforming its point of application. 7

While I have shown way of illustration an' escapemenjt. wheel as themovable [or spaced escape-merit member, it is evident that any otherwell known form of movable or spacedescapement member, such as, for an;

stance a straight rack, of w-hich the. escape ment wheel 21 illustratedis only a curved, varlety, may be used 1n connection with my nnprovedescapemen't' mechamsm, without departing from the spirit of myinventiont I} Icla im z v '1. In an escapement mechamsm, the corn eachtooth of said w the throw of said dogs.

bination' with an escapement wheel tending to rotate in one direction, avibrating member disposed to operate transversely to the plane ofrotation of said wheel havin two dogs engagin each tooth of said wheesuccessively,- said dogs interconnected to cause one dog when moved bsaid wheel to positively move the other 0 oppositely to the direction ofrotation '0 said wheel, and .meansfor limiting the throw of said dogs.

2. In an escapement mechanism, the com-.

bination. with an escapement wheel tending to rotate in'one direction, alever disposed, to rock transversely to the plane of rotation of'saidwheel, having two dogs engagin v eel successively, sai dogsinterconnected to cause one dog when movedby said wheel to positivelymove the other dog oppositely to the direction of roi tation of saidwheel, and means for limiting 3. In aueScapement mechanism thecombination with an escapement wheel tending to rotate in one direction,a vibrating mem ber disposed to operate transversely to the plane ofrotation of said wheel havin twodogs engaging each tooth of said wheesuccessively, the first dog pivoted as a lever of i the second order atone of its ends, the secmoving said second dog to rocli transversely tothe plane of rotation pivoted as a lever ofthe second order at one ofsaid wheel having two dogs: engaging each tooth of said wheelsuccessively, the first dog ofii'a ends, the second dog pivoted as alever of the first order intermediate its ends, said -first :iog havingoperative engagement intermediate its ends with the actuatlng end ofsaid second dog, said first dog when moved by said wheel moving saidsecond dog positively opposite to the direction of rotation of saidwheel and said second dog when moved by said wheel moving said first dogin said opposite direction and means for limiting the throw .of saiddogs.

5. In an escapement mechanism, the combination with an escapement wheeltending to rotatein one direction, a vibrating 1ne1nher dis osed tooperate transversely to the plane 0 qrotation of said wheel, having twodogs fixed together and a third dog pivoted between said-twodogs, saidinner dog and said outer dogs interconnected to cause said wheel whenmovm the inner dog in one direction to throw t e outer dogs positivelyin the opposite direction ofits rotation, and when moving either of the.outer dogs to throw said inner dog positively in the op 0- sitedirection of its rotation, and means or limiting the throw ofsaid dogs.

6. In an escapement mechanism, the combmation with an escapement wheeltending to rotate in one direction, a lever disposed to rocktransversely to the plane of rotation of said wheel, having two dogsfixed to ether and a third dog pivoted between sai two dogs, sa d mnerdog and said outer dogs interconnected to cause said wheel when move ingthe inner dog in one direction to throw the outer dogs positively in theopposite direction ofits rotation, and when moving either of the outerdogs to throw said inner dog positively in the o posite direction of itsrotation, and means flir limiting the throw of said dogs.

7. In an escapement mechanism, the combination with an escapement wheeltending 'to rotate in one direction, a vibrating member d sposed to,o'perate'transvers'ely to the plane of rotation of said wheel, havingtwo dogs fixed together and a third dog pivoted between said two dogs,said inner dog and said outer dogs interconnected to cause said wheelwhen moving the inner dog in one direction to throw the outer dogspositively in the opposite direction ofits rotation, and when movingeither of the outer dogs to throw said inner dog positively in theopposite direction of its rotation, means for limiting the throw of saiddogs, and means causing the teeth of said wheel to cooperate with theinner dog and either of the outer dogs at will.

8. In an escapement mechanism the com- I bination with an escapementwheel tending to rotate in one -direction, a vibrating member disposedto operate transversely to the plane of rotation of said wheel havingtwo dogs fixed together and a third d pivoted between said two dogs,said outer ogs pivoted as levers of the second order at one of theirends, said inn'ercdog pivoted as a lever of the first order intermediateits ends, said outer dogs having operative engagement intermediate theirends with the actuating end of said innerdog, said wheel when engagingand throwing each of the outer dogs in one.

direction causing the inner dog to move positively in the oppositedirection of its rotation, and when engaging and throwlng the inner dogin one direction causing said outer dogs to move in the oppositedirection and means for limitingthe throw of said dogs. I

9. In an escapement mechanism thecombination with an escapement wheeltendm to rotate in one direction, a lever disposed to rock transverselyto the plane of rotation of said wheel having two dogs fixed togetherand a third dog pivoted between saidtwo dogs, said outer dogs pivoted aslevers ot' the second order at one of their ends, the inner dog pivotedas a lever of the first orderinterinediate its ends, said outer dogshaving operative engagement intermediate their ends with the actuatingend of said inner dog, said wheel when moving and throwing one of theouter dogs in one direction causing the inner dog to move positively inthe opposite direction of-its'rotation, and when aengagmg and throwingthe inner dog in one direction causing said outer dogs "to move in "theopposite direction and means for limit- :Iing'the throw of said dogs. t:10. In an escapeinent mechanism, the 'ibinationwith an escapeineiitwheel tending cointo rotate in one direction, a vibrating memberdisposed to operate transversely to the plane of rotation of said wheel,having two fwhen engaging and moving either of the titer dogs to throwsaid inner dog posrdogs fixed together and a third dog pivoted betweensaid two dogs, said outer dogs pivoted as levers of the second orderatone ot' their ends, said'inner dog pivoted as a lever of the firstorder intermediate its ends, said outer dogs having operative engagementiii- -terinediate their ends with the actuating end bination with anescapement wheel tending to rotate in one direction,-a vibrating memberdisposed to operate transversely to the plane of rotation of said wheel,having two dogs fixed together and a third-dog pivoted :between said twodogs, said inner dog and "SfllCl outer dogs interconnected to caiisesaidwheel when moving the inner dog 1110116 direction to throw the outerdogs positively in the opposite direction of its rotation, and

" tively in the opposite direction of its rotaplane of rotation of saiddogs causing the *teeth of said wheel to'rooptral'e with the iiition,means for limitingthe throw of said dogs, and a slide disposed on saidvibrating member to be shifted transversely to the *iier dog andeit'heroftheiiuter dogs at-will.

rook transversely to the plane of rotation said wheel, having twodogsfixed toge tl jer and a third dog pivoted between said in an escapeinentniei-hanisin, the ro'in "bllltltlOll with an escapeinent wheel tending#to rotate in one dircctioii a lever disposed" two dogs, said inner dogand said outer dogs interconnected to cause said wheel when engaging andmoving the inner dog in one direction to throw theouter dogspositively'in the opposite direction of itsrotation, and when engagingand moving eitherofthe outer dogs to throw said inner dog posi tively inthe opposite direction of its'rotation, means for limiting the throwofsaid dogs, and a slide disposed on said rocking lever to be shiftedtransversely to the plane of rotation of said dogs causing the teeth ofsaid wheel to cooperate with the-inner dog and-either ofthe outer dogsatwill.

13. Inan escapement mechanism the :combination withan escapenient wheeltending to rotate in one direction, a vibratingmem ber disposed tooperatetransversely to. the

[plane of rotation of said wheel having two dogs fixed together and athird dog pivoted between said two dogs, said outer dogs pivoted tIS'lQYGlS of the secondorder atone ot' theirends, the inner dog pivoted asa lever of the first orderintermediate its ends,'said outer dogs havingoperative engagement intermediate their ends with the-actuating end ofsaid inner dog, said wheel when engaging and throwing one of the outerdogsin one direction causing the inner dog to move positively in theopposite direction of its r0- tation, and when engaging and throwing theinner dog in one direction causing said outerdogs to move in theopposite direction, means for limiting the throw of said dogs and aslide disposed on said vibratingmember .to be shifted transversely tothe planeofrotation of said wheel-bearing the pivots of said dogs,causing the teeth of said 'wheel' to cooperate with the-inner dog andeither of the outer dogs at will. 1

ll. In an escapeinent' nieclianisni-t-he coinhination with an escapeineit wheel tending to rotate in one direction, a lever disposed to rocktransversely to the plane ot'rotation of said wheel. having two dogsfixed"to gether and a third dog pivoted betweeirsaid two dogs,,saidouter dogs pivoted as levers ot' the second order at one of their ends,the inner dog pivoted as a lever ot-th'e first-order intermediate itsends, said outer. dogs having operative engagement intermediate 1 their"ends with the actuating end (if-said inner dog. said wheel whenengaging and throwing one of the outer dogs in'o'ne direction causingthe inner dog to move positively in the opposite direction of its 1Ultll lOIl, and I when engaging and th'r \\'ing the inner dog in onedirection cansingsaiijl 'o-iiter: dogs to inov'e in the oppositedirection, iDlBitllS'fOI liniiting the throw'ol said dogs,.-a id-a'slide disposed on said rocking leverto' be shifted l liil"iis\ei"sel;\to the plane ot'" rotation o'f said dogs causing the teeth ofsaidewheel; to cooperate with'the inner dog and eitliei'w'ottli'e? outerdogs at ,will.

15 In an escapement mechanism, thecombination with an escapementwheeltending to rotate in one direct on, a vibrating member disposed tooperate transversely to the plane of rotation of said wheel, having twodogs fixed togetherand-a thirddog pivoted between said two vdogs, saidinner dog and said outer dogs interconnected to cause said wheel whenengaging and movingthe. inner dog in onedirection to throw the outerdogs positively in the opposite direction of its rotation, and whenengaging and moving either of the outer dogs to throw said inner dogpositively in the opposite direction of its rotation, means for limitingthe throw of said dogs, and a slide disposed on said vibrating member tobe shiftedtransversely t0 the plane of rotation of said dogs causing theteeth of said wheel to cooperate with the inner dog and either of theouter dogs at will, and means for. compensating for the.

' steps lost by said shifting motion.

16. In an escapement mechanism, the combination with an escapement wheeltending to rotate in one direction, a vibrating member disposed tooperate transversely to the plane of rotation of said wheel, having two'dogs fixed together and a third dog pivoted between said two dogs, saidinner dog and said outer dogs interconnected to cause said wheel whenengaging and moving the inner dogin the direction to throw the oiiterdogs ing member to be shifted at a suitable angle to the plane ofrotation of saidwheel, causing when shifted the inner dogand either ofthe outer dogs to cooperate to control the step by step motion-of saidwheel'at will and to compensate for the step lost by saidshifting'motion. y

=17. In a typewriting machine the combination of a spaced member havingteeth and a detaining member and means for'moving one of said members atright angles to the direction of movement'of the spaced mem-' ber, saiddetaining membercomprising two dogs engaging each tooth of the. cooperating escapement or spaced member successively, said dogs interconnectedto cause one dog when engaged and moved. by said teeth to positivelymove the other dog oppositely to the said direction of movement andmeans for limiting the throw of said dogs];

w '18; In a typewriting machinethe combi- 1 nation of a spaced memberhavin teeth and a detaining member and means or moving one of saidmembers at right'angles to the direction of 'movem'ent'of the spacedmemb nation of a spacmg .escapement memben ber, said detaining membercomprising-two ing said -,change in oofip'eration.

dogs engaging each tooth of the coas me ing escapement or spaced membersuccessively, said dogs interconnected to cause one dog when engaged andmoved by said teeth -.to positively move the other dog oppositely to'thesaid direction of movement, the alternate engagement of said dogscausing the escapement mechanism to perform'long and short stepssuccessively, and means for limiting the throw of said dogs. I

19. In a-typewriti'ng machine the combination of a spacedmember havinteeth and a detainin member and means" or moving one ofsai members atright angles to the direction of movement of the" spaced memher, saiddetaining member comprising three dogs suitably pivoted and disposed. tocause each tooth of 1ts coiiperating member to co-,

operate with the inner dog andeitlier of the other dogs, said inner dogand said outerdogs intexconnected'to cause a tooth engaging and movingthe inner dog to throw the outer cooperating dog positively opposite tothe direction. ofmovement and when engag-.

ing and moving either of the outer do to throw the inner dopositively-in sai o posite direction,,-an means -for limiting t e throwof saiddogs,

dogs suitably, pivotedandinterconnected to 'cause the teeth ofsaid saced member to cooperate with .the inner... og and either of the outerdogs, the coiiperation of said inner dog with one., o f said outer dogs'causing said spaced member toI'perform' alternatel long -.and shortsteps, the coope ation of sai inner dog with the other 'of'said outerdogscaus ing saidfspaced' -me'rnber'. to perform alternately short andlong steps, and means caus- 21; In an escapement mechanism, thecombination of 'a spacing escapement member, movable in one direction,and a detaining escapement' member ada ted to vibrate transversely tothe'direction of movement of said movable member, having'a slide disosedto be shifted on said vibratin member in said transverse direction saidside having three dogs suitably pivoted and disposed to cause the teethof said movable member to cooperate with the inner do and either ingsaid movablememberto rform alternately long and short steps, ecoiiperation of said inner dog with the other of said outer dogs causin'said movable member to perform alternate y short [and long steps;

22. In an escapement mechanism, the com- 20.- Ina typewritin'g machinethe combination of a spaced member havin teeth and a detaini "of theouter dogs, the-cobp'era ion of said} I inner dog with one of said outerdogs cansmovable in one direction, and a detaining nieinbenadapted tovibrate transversely to the direction of movement-of said movablemember, having a dog adapted to perinanently cooperate with the teeth ofsaid movable memberand two dogs adapted to selectively cooperate withthe teeth'of said movable member, the cooperation of said permanentlyoperating dog with one of said selectively operating dogs causing theescapeineut mechanism to perform successively first a long and then ashort step, the cooperation of said permanent operating-dog with theother of said selectively operating dogs causingsaid escapelnentmechanisinito perform sue-- "JOHN A. HAGERSTROM.

Witnesses:

G. V. CAMPBELL, A. L. CAMPBELL.

